<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/login" method="post">
<input type="text" name="userName"><br>
<input type="submit" value="登录">
</form>
</body>
</html>